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selisih = b = 10-7 = 3
Sn = n/2 (2a +(n-1)b)
S50 = 50/2 [(2 x 7) + (50-1)3]
S50 = 25 (14 + (49 x 3)
S50 = 25 ( 14 + 147)
S50 = 25 (161)
S50 = 4025
. = 25(14+49.3)
=25(14+147)
= 25(161)
= 4025